💡 Change Scope

• Small Change: Fast feedback, localized UI/logic, low-risk.
• Large Change: New feature, cross-boundary logic, runtime-risk (persistence, IPC, lifecycle, recovery).

📝 What Does This PR Do?

• Adds a lightweight GitHub Actions workflow to validate PR descriptions against .github/pull_request_template.md.
• Keeps the workflow thin by moving the parsing and validation rules into a reusable Node CLI and library.
• Adds unit coverage for required sections, exclusive Small/Large selection, mandatory summary content, and required Large Change spec content.
• Avoids coupling PR metadata validation to the existing heavy CI pipeline.

🏗️ Large Change Spec (Required if "Large Change" is checked)

1. Context & Business Logic

N/A. Small CI/process change only.

2. State Ownership & Invariants

N/A. No runtime state ownership changes.

3. Verification Plan & Regression Layer

N/A. Verified as a Small Change through targeted script tests plus full pnpm pre-commit.

✅ Delivery & Compliance Checklist

• My code passes the ultimate gatekeeper: pnpm pre-commit is completely green.
• I have signed the CLA if required (see CLA.md).
• I have included new tests to lock down the behavior (or explicitly stated why it's untestable).
• I have strictly adhered to the DEVELOPMENT.md architectural boundaries.
• I have attached a screenshot or screen recording (if this touches the UI).
• I have updated the documentation accordingly (if adding a feature or changing a contract).

📸 Screenshots / Visual Evidence

Not applicable. No UI changes.